swollen ankles

My ankles get huge and swollen when I'm on my feet for a long time, but they instantly go back down once I put them up for awhile. I'm 32 weeks pregnant and now I kinda feel uneasy doing about anything (like walking around) do I just take it easy or try and stay off my feet as much as possible? I'm a FTM and when I saw how huge my ankles were yesterday it freaked me out